Pneumatic hammer.



n. T.,1E1olls.

V PNEUMATIC HAMMER.

PPLICATION- FILED NOV. 23. 1914.

4 111mm 'May 11, 1915.

" .nnLrHIs '12. LELoIs, or'cHIcAeo, ILLINOIS.

l PNEMATIC IIAIIIIMIER.l i

messer.

Application filed November 23,1914. Serial No. 873,448.

To all whom it may concern:

Be it known that I, DELPHIS T. LELoIs, a citizen of the United States,residing at Chicago, "in" the county of Cook and State of Illinois,.(wlioseV post-office address is' 11541 Perry avenue, Chicago,Illinois), have invented certain new and useful Improvements inPneumatic Hammers, asset forth in the annexed speciication.

My-invention relates to pneumatic ham-` `mers and the chiefebject ofthe-improv l5 accidental dislodgment of the die fromthe impact of thehammer,such ,adischarge being 'as frequent source of annoyance' orinjury in case the throttle lever is inadvertently ments whichconstitute the subject matter -of thisapplication for :patent is toprovide a locking or retaining mechanismfor holds,

ing the die'in its seat, thuspreventing the moved While the hammer ingposition. V

is out of itswork- `Other objects "of my invention are to furnisll. aretainingmechanism for the die lof' a pneumaticl hammer that is capableo f beingyquickly and easily removed'fromits engag- 4 ing position thuspermittingthe die to bel readily removed and another substituted,

j the reassemblingof -theholder being speedily accomplished; -toprovidea construction that will tend to strengthen the -muzzle of. the casingor shell rather than to weaken. it,

and to produce a device for the purpose stated that can be readilyapplied to the barrels of the various types of pneumatic hammers inpresent use.

I .accomplish the desired I, results bya simple and eiiicient mechanismillustrated in the accompanying drawings which forms a part'of thisspecification, the detailsof construction being disclosed in .thefollowing views:-

Figure 1 is a sectional elevation of a portion ofthe shell or barrel ofa pneumatic hammer embodying my improvements; ig. 2 is a side elevationof the die; Flg. 3 1s a rear end elevation of the split collar, and

Fig. 4i is an end elevation of the retaining ring. y

Referring to the details of the drawing,

,the numeral 5 indicates the cylindrical shell or barrel of a pneumatichammer similar to those in ordinary use.' I/Vithin the bore 6 of saidbarrel is the usual piston orhammer 7, which is free to reciprocate insaid bore. Inserted in the end of the barrel 5 is a die, comprising abody portion 8 slidably tting Specification o f Letters Patent.

Patented May 11, i915.

the bore 6 and providedrwith an'annular collar 9 forming a shoulder orstop which thedie The" limits the -inward movement ofv striking the endface ofthe barrel.

.portion 10 of the'die in front of theicollar 9 is-made taperingtowardthe end and isofless diameter than the collar adjacent the latterforming a shoulder 9a. As devices of lthis classare ordinarilyconstructed there isl nothing to prevent the die from being drawn ordislodged from its position inthe nozzle of the barrel, except whenopposed by somesufficiently resisting abutment, as, for instance, whenin' opposition'with the piece of -work which is to b e operated upon,this alone preventing the die. from :being driven clear of the barrel bythe impact of the hammer 7. For the purpose of retaining the die I initsseat, Whether the device-is in operation or idle, I provide a splitcollar or sleeve, comprising'two duplicate sectionsor halves 1-1, whichsurround4 the diefand muzzle the barrel...` The forward end 'of thesections is fitted to closely engage the tapering part 10 lof the dieand the rear part is counterbored to embrace the extremity ofthe barrel.The

rear ends of the collar er. sleeve vsections 1l areA provided withinwardly projecting flanges 12 whlch engage a peripheral recess orgroove 13 cut in the outer. surface of the barrel at such adistancefromthe end that whenI assembled there'will be an interval 14:between the end ofthe barrel and the shoul-v ,der- 15 'formed by thecounterbore. An an- 1 nular recess 16 cut in said shoulder lis adaptedto receive the collar 9 as shown in Fig. 1. The rear portions of saidsleeve sections 11 are embraced by a retaining or .clamping ring orferrule 17. The outersurfaces of the said sections 11 'are furnishedwith circumferentially extended lugs or abutments 18l i which engagethe"y front margin of the said ring 17, thus constituting `stops whichpre-- vent the ring from slipping over the end of the sleeve and thusbecoming dislodged from the sleeve.

Ico

It will be readily understood that when the die and sleeve sections areassembled in the manner shown. in Fig. 1 and the clasp ring or ferrule17 placed thereover, the said sections will be fir'mly retained by thering, and the die, in turn, will be held in position by the forward endof the embracing split sleeve, its reciprocating movement, however, willnot be interfered with, since it is loosely fitted in its seat.

rang-tn pass over them.

. the rin v .aa the jaro theherimpact upon the may he hir ly te causethe retaining ring :lr bacardand release the sections, l 'meerderetaining catches in the form of dat L u 1 19 secured to' the outer sideof the by suitable screws 20,- and having t" ends extending forward toengage. rear margins or the. said ring 17, the en ci the springs beingbent downwardens shown at`21, to present a larger surf-ace. .Y y v fe a:ma: the device the ring 17 is first @Siep-ed the endof the barrel 5,the

...rags 19 being vdepressed to permit'-the The selected die is insertedrin the muzzleof the barrel, itii the collar 9-is against the barrel,end. The sections of the split sleevecan novv be inieitiy placed npontheopposite sides o the with .the ianges 12 engaging the 'lt is now a veryeasy matter to 1 e 1'? iorvvard over the springs 19 upon t e rearportions-of the sections rt is stopped by the abutments 18g, when.'thesprings 19 will spring into engaging asition. To remove the engagingweave 13.

seeve 11 it is only necessary to reverse thev aseve- 'mevementa firstdepressing the springs 1% and'sliding the ring back so as to the sleevewhen the sections of the latter niiii he reeiy removed: This givesangeppnrtnriity to ,quickly change the dies, and as e 'eqnentiynecessary 1n certain lands Werk. the removable feature is one of valereand the employment of a slip sie te' secure the split' sleeves, whichcan an ennsuai advantage in the econanipniated with' great ease andrapidity,l

Messer omy-of time, Whiie the particular construction made use of liscalcnlated'to strengthen the parts to which the device is connected.

ln applying my improved die retaining mechanism 'to the type ofpneumatic hainmers 1n common use itis only necessary to turn down thetapering front end of the'- die in order lto form the shoulder 9a, toform the groove 13 for the ila-nge 12, and aix the ring retainingsprings 19. i'

Having described my invention, What l claim' as nen7 and desire to'secure' by Letters Patent is`,- Y.

1. A `tooLholder for pneumatic hammers comprising semi-circular` jawsdetachably engaging the hammer barrel and' the tool and adapted topermit longitudinal move' ment of the latter,A a sleeve seated on andembracing said jaws, and means secured to said barrel -and detachabl'yengaging said ysleeve .for holding it against displacement.

2. A. tool-holder for pneumatic hammers comprising semi-circular jawsdetachably engaging` the' hammer barrel and the tooland adapted topermit longitudinalmovement of the latter, said jaws each having arecess in its outer face shouldered at one end,

a closed sleeve detachably fitting said recess v and'clarnping said]a\vs in operative .position and springs secured to the barrel andhaving ,their free ends removably engaging said

